how to calculate the typical reduction for the below data and also find the evidence that the mean reduction is different from 0

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below is my data set

structure(list(BP = c(8L, 12L, 10L, 14L, 2L, 0L, 0L, -6L, 0L, 
1L, 2L, -3L, -4L, 2L), Diet = structure(c(1L, 1L, 1L, 1L, 1L, 
1L, 1L, 2L, 2L,


                      
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